[core, ios, macos] Added layers and sources properties to MGLStyle

Added new layers and sources properties to MGLStyle that contain all the style’s layers and sources, respectively. These properties are KVC-compliant with all the mutable to-many methods. Layers are ordered from topmost to bottommost, for consistency with Cocoa APIs where front/first means top and back/last means bottom.

Also added storage for mbgl::style::Source in MGLSource proper for wrapping AnnotationSource. Until the style finishes loading, its name property is set to nil.

Fixes #6003.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/mbgl/map/map.hpp b/include/mbgl/map/map.hpp
index 0c14600c75..10153c54e3 100644
--- a/include/mbgl/map/map.hpp
+++ b/include/mbgl/map/map.hpp
@@ -157,11 +157,13 @@ public:
     void removeAnnotation(AnnotationID);
 
     // Sources
+    std::vector<style::Source*> getSources();
     style::Source* getSource(const std::string& sourceID);
     void addSource(std::unique_ptr<style::Source>);
     std::unique_ptr<style::Source> removeSource(const std::string& sourceID);
 
     // Layers
+    std::vector<style::Layer*> getLayers();
     style::Layer* getLayer(const std::string& layerID);
     void addLayer(std::unique_ptr<style::Layer>, const optional<std::string>& beforeLayerID = {});
     std::unique_ptr<style::Layer> removeLayer(const std::string& layerID);